Rotating band



July 18, 1944.

J. H. CHURCH ROTATING BAND Filed Sept. 28,- 1942 Jusejph H- Ehurch.

Patented July is, 1944 UNITED sures PATENT QFFIc- E ROTATING BAND-Joseph H. Church, Austin, Minn. Application September 28, 1942, SerialNo. 459,915

' 3 Claims. (Cl. 29-12) (Granted under the act of March 3, 1883,88

amended April 30, 1928; 370 0. G. 757) The invention described hereinmay be manufactured and used by or for the Government for governmentalpurposes, without the payment to me of any royalty thereon. I

The present invention relates to a method of applyingrotating bands toprojectiles.

It is among the objects of the present invention to apply a rotatingband to a projectile without the necessity of machining, cutting orgrooving such projectile and without tendency toward displacement,fringing or irregular skirting. I

In accomplishing the above objects a powdered metal material is appliedto the projectile brazed thereto and then used as a base for taking upthe metal (e. g.-copper) of the rotating band.

In the drawings Figs. 1 to -'l are diagrammatic side views and showsuccessive stages in application oi the rotating band,v while Fig. 8 isa cross sectional detail on an enlarged scale of the band as applied atposition ll.

As shown in Fig. 2, the annular plate or cuff i2 is attached to theprojectile at position I I and then a purely powdered base metal ormixture of metals is placed on the annular plate or cufi l2. The metals,may vary but they should be sui- The projectile I is placed between therotating elements I! and center bearing point it as shown in Fig. 6positioned so that the sintered band IE will dip into and soak up themolten cop ing said metal and then simultaneously sintering ficientlyhighly powdered to sinter together with heating and the preferredmixtures include copper, nickel, cobalt, lead. zinc, antimony and soforth. I

The preferred combinations are, of copper and nickel powder using 25% to75% of each metal.

The powder mixture I 3 as shown in Fig. 3 is then compressed into theprojectile ill by the clamping jaws it, the jaws ll applying suificientpressure and having such interior shape to form the desired shape andcross section as indicated at i5 inFlgA. The projectile ID as showninFlg. 5 is then placed in a cylindrical casing l6 provided with a highfrequency induction coil which heats up the band i5 until the finelypowdered compressed ,metal thereof slnters together and is brazed to theprojectile.

and brazing it to the projectile wall, impregnating the sinteredmaterial with a moltenmetal. and finally shaping the s'lntered-andimpregnated band.

2. A method of applying a rotating band to a projectile which comprisesencircling the projectile with a quantity of powdered metal, compressingsaid metal, subjecting the projectile and the powdered metal to heatinginfluence of a high frequency coil whereby the band is simultaneouslysintered and brazed to the projectile, subjecting the sintered andbrazed band to a bath of molten metal to impregnate said 'band, andfinally shaping the band.

3. A method ofvapplying a rotating band to a projectile which comprisesencircling the projectile with a quantity of powdered metal,compregnated, and finally shaping the band.

JOSEPH H. CHURCH.

